How to test if object is sequence, or iterable?

[Tim N. van der Leeuw]

Hi,

I'd like to know if there's a way to check if an object is a sequence,
or an iterable. Something like issequence() or isiterable().

Does something like that exist? (Something which, in case of iterable,
doesn't consume the first element of the iterable)

Regards,

--Tim